JPH06148565A - Image display device - Google Patents

Abstract

PURPOSE:To generate an image with a wide angle of view field by using a concave mirror having a specific view field and a bobbin-form curving, and producing the virtual image of a given image which has a specific angle of view and a barrel-form curving. CONSTITUTION:An image having an angle of view over 180 deg. and a barrel- form curving is displayed on an image display plate 8, and in front of it, a concave mirror 11 which has a bobbin-form curving aberration of a size canceling the barrel-form curving and an angle of view field over 180 deg. when viewed from the side with observed is installed. When an image of barrel-form curving is displayed on the image display plate 8, therefore, the barrel-form curving and bobbin-form curving cancel each other, and an image with corrected curving is obtained. That is, a virtual image as a screen as large as exceeding 180 deg. is generated in the view field to the left and right enwrapping the observer 5, so that a natural projected image which does not cause him to be concious of the frame of the screen substantially is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device.

[0002]

2. Description of the Related Art FIG. 15 is a sectional view showing a conventional image display device disclosed in, for example, Japanese Patent Laid-Open No. 18588/1992. In the figure, 1 is an image display plate for displaying an original image 2 on the front surface, 3 is a convex lens, 4 is a casing or an image display device main body for fixing the image display plate 1 and the convex lens 3, 5 is a viewer, 6 is an image display A ray 7 at the right end of the original image 2 emitted from the plate 1 is a virtual image of the original image 2 generated at a distance by the convex lens 3, and an angle between the ray 6 and the optical axis is θ1.

Next, the operation will be described. The convex lens 3 refracts the light rays of the original image 2 to generate a virtual image 7 in the distance.
For example, the right end of the image is viewed by the viewer 5 in the right direction by θ1.

[0004]

Since the conventional image display device is constructed as described above, unless the focal length can be made extremely small with respect to the aperture of the lens, the field of view close to 180 ° for the viewer 5. To provide a corner image,
As shown in FIG. 16, the image display plate 1 must be made into an impractical size so that θ2 approaches 90 °, and it is theoretically impossible to provide an image with a viewing angle of 180 ° or more. There was a problem.

The present invention has been made in order to solve the above problems, and not only can provide a viewer with an image having a viewing angle close to 180 ° without enlarging the image display plate. The object is to obtain an image display device that can provide an image with a viewing angle of 180 ° or more.

[0006]

An image display device according to the invention of claim 1 displays an image having an angle of view of 180 ° or more and barrel distortion on an image display plate, and the image display device is provided in front of the image display plate. A concave mirror having a pincushion distortion aberration that cancels the barrel distortion and having a viewing angle of 180 ° or more viewed from the viewer side is arranged.

An image display apparatus according to a second aspect of the invention is a concave mirror of the first aspect, which is a half mirror type concave mirror (hereinafter referred to as a transmissive concave mirror) capable of transmitting light rays from the front.

[0008]

In the image display device according to the first aspect of the present invention, when the concave mirror generates a virtual image of the image on the image display plate, the pincushion distortion of the concave mirror causes the angle of view displayed by the image display plate to be 18 degrees.
The viewing angle is set to 1 to cancel barrel distortion of images over 0 °.
A virtual image without distortion is generated at 80 ° or more.

In the image display device according to the second aspect of the present invention, the concave mirror further transmits the light beam from the front to the rear.

[0010]

EXAMPLES Example 1. 1 is a top view showing an image display device according to an embodiment of the invention of claim 1, and FIG. 2 is a side view of the image display device of FIG. In the figure, 5 is a viewer, 8 is an intersection, for example, as shown in FIG. 3, and the distortion characteristics are represented by aberration curves as shown in FIG. Image display plate for displaying an image as an original image 10, reference numeral 11 is a concave mirror having a pincushion distortion as shown in FIG. 6 in which the distortion characteristic of a virtual image obtained at a distance is substantially the same curve as that of FIG. Reference numeral 12 is a casing or an image display device main body for fixing the image display plate 8 and the concave mirror 11, 13 is a light ray at the right end of the original image 10 emitted from the image display plate 8, and 14 is an original image generated by the concave mirror 11 at a distance The virtual image of 10 and the angle between the light ray 13 and the optical axis is θ3.

Next, the operation will be described. Image display board 8
When the rectangle 15a is displayed as the original image 10 in FIG. 7 and the right side of the viewer 5 is taken by the camera 16 as shown in FIG.
A pincushion distortion of 1 results in an image 17 displaying a graphic 15b as shown in FIG. Since the concave mirror 11 has such a characteristic, when the image of the barrel distortion as shown in FIG. 5 is displayed on the image display plate 8, the barrel distortion and the pincushion distortion cancel each other, so that the same viewing is possible. When the right side of the person 5 is photographed by the camera 16, a distortion-corrected image showing an intersection is obtained as shown in FIG. That is, as shown in FIG. 13, a virtual image as a large screen exceeding 180 ° appears in the left and right visual fields enclosing the viewer 5, so that a natural image can be obtained with almost no awareness of the frame of the screen.

Example 2. The original image 10 may be computer graphics (CG). FIG. 11 shows an example of a method of creating a CG as an image corresponding to an image taken by the video camera 9 with a fisheye lens. Usually a computer and C
CG by CG creation device consisting of G creation software
Is performed in a procedure similar to the work of photographing a subject with a camera, but in this embodiment, the convex mirror 1 is placed in front of the camera 18.
9 is fixed, and the image reflected on the convex mirror 19 is taken by the camera 1.
Imagine shooting at 8. If the image is created with such settings, the CG that is almost the same as the image of FIG. 5 obtained in the case of FIG. 3 can be obtained. Further, when the CG creating apparatus includes a function of expressing the effect of the fisheye lens, it is only necessary to use that function. The CG may be a still image or a moving image.

Since the original image is almost the same as that in the first embodiment, the operation is performed in the same manner.

Example 3. FIG. 12 is a top view showing an image display device according to an embodiment of the present invention. In the figure, reference numeral 20 is a transmissive concave mirror having the same distortion characteristics as the concave mirror 11 in the first embodiment and transmitting the light ray 21 from the front, and the other is exactly the same as in the first embodiment.

Next, the operation will be described. The transmissive concave mirror 20 performs exactly the same operation as the concave mirror 11 in the first embodiment, and at the same time transmits the light beam 21 from the front.

[0016] For example, in the case of using it for a view, by displaying the explanatory text or the drawing as shown in Fig. 14, the explanatory content can be combined with the object. The position of the virtual image at that time may be infinite.

Embodiment 4. In the first and third embodiments of the present invention, the video camera 9 with a fisheye lens is adopted as a photographing device for obtaining the original image 10. However, the camera used here may be a solid-state image sensor or a silver salt film. It may be used, a moving image such as a general video camera or a movie film camera, or a still image such as a still video camera or a general silver halide film camera. Further, the image display plate 8 may be a cathode ray tube, a liquid crystal panel, or a printing paper.

The operation is the same as in the first and third embodiments.

[0019]

As described above, according to the first aspect of the present invention, the virtual image of the image having the field angle of 180 ° or more and the barrel distortion is formed by the concave mirror having the visual field of 180 ° or more and the pincushion distortion. Since it is generated, there is an effect that an image with a viewing angle of 180 ° or more can be viewed.

Further, according to the second aspect of the invention, since the transmissive concave mirror is adopted as the concave mirror, there is an effect that a further front view can be obtained.

[Brief description of drawings]

FIG. 1 is a top view showing an image display device according to an embodiment of the present invention.

FIG. 2 is a side view of the image display device of FIG.

FIG. 3 is a top view showing a shooting situation for obtaining an original image in Embodiment 1 of the present invention.

FIG. 4 is a graph showing the distortion of the image formed with respect to the angle of incidence on the fisheye lens in Example 1 of the present invention, which is represented by an aberration curve.

FIG. 5 is a diagram showing an image photographed by a fisheye lens according to the first embodiment of the present invention.

FIG. 6 shows the distortion of the image necessary for emitting at that angle with respect to the emission angle from the concave mirror in the first embodiment of the present invention,
It is a graph represented by an aberration curve.

FIG. 7 is a diagram showing an image provisionally displayed on the image display plate for explaining the characteristics of the concave mirror in Example 1 of the present invention.

FIG. 8 is a top view showing a situation in which the image display device is tentatively viewed by the camera from the position of the viewer in order to explain the characteristics of the concave mirror in Embodiment 1 of the present invention.

9 is a virtual image that a viewer will see when the image shown in FIG. 7 is displayed on the image display plate of the image display device according to the first embodiment of the present invention, as shown in FIG. It is a figure shown as an obtained image.

10 is a virtual image that a viewer will see when the image shown in FIG. 5 is displayed on the image display plate of the image display device according to the first embodiment of the present invention, as shown in FIG. It is a figure shown as an obtained image.

FIG. 11 is a diagram showing a model for creating computer graphics as an original image according to the second embodiment of the present invention.

FIG. 12 is a top view showing an image display device according to an embodiment of the present invention.

FIG. 13 is an image display device according to the first embodiment of the present invention,
The virtual image seen by the viewer when looking through this image display device,
It is the figure shown as being visible to a third party.

FIG. 14 is a diagram showing a situation in which the image display device according to the third embodiment of the present invention is installed for viewing.

FIG. 15 is a top view showing a conventional image display device.

FIG. 16 is a top view showing an image display device that attempts to obtain an image with a viewing angle close to 180 ° by the principle of the conventional image display device.

[Explanation of symbols]

 8 image display board 11 concave mirror 14 virtual image 20 transmissive concave mirror 21 light rays from the front

Claims (2)

[Claims] 1. An image display board displaying an image having a barrel distortion with an angle of view of 180 ° or more, and a virtual image of an image displayed by the image display board having a pincushion distortion capable of canceling the barrel distortion. An image display device, comprising: a concave mirror having a viewing angle of 180 ° or more when viewed from the concave side of the concave surface that generates the image. 2. The image display device according to claim 1, wherein the concave mirror is a transmissive concave mirror capable of transmitting light rays from the front.